Which is fine provided you know what you're doing with installation and setup... Sky provide a router with username/password already set and expect that to be used... and their tech support can be less than helpful if you're not using the supplied equipment... and if reasonably current then Sky provide 802.11n as a matter of course...

In that case it might be an option to use the Sky equipment as a modem only and to attach to it a more powerful wifi router. Using a new router made all the difference for wifi reception in our flat.
A combination of powerline (which utilizes the power network) and wifi like this might also be an option: http://www.devolo.co.uk/consumer/77_...on_1.html?l=en